Whiter than white refers to something or someone being very pure, honest, and moral.
Extremely clean and white.
Never doing anything wrong.
1. I never believed in the whiter than white princess depicted in movies.
2. They expect standards of behaviour whiter than white.
3. These children are whiter than white, they never do anything wrong.
4. The children that I met during the outreach program were whiter than white.
clean, exemplary, immaculate, impeccable, innocent, noble, pure, saintly, spotless, unblemished, virtuous, worthy